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diff --git a/engine/exceptions.hpp b/engine/exceptions.hpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file engine/exceptions.hpp
+/// Exception types raised by the engine module.
+
+#if !defined(ENGINE_EXCEPTIONS_HPP)
+#define ENGINE_EXCEPTIONS_HPP
+
+#include <stdexcept>
+
+#include "utils/fs/path.hpp"
+
+namespace engine {
+
+
+/// Base exception for engine errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    virtual ~error(void) throw();
+};
+
+
+/// Error while processing data.
+class format_error : public error {
+public:
+    explicit format_error(const std::string&);
+    virtual ~format_error(void) throw();
+};
+
+
+/// Error while parsing external data.
+class load_error : public error {
+public:
+    /// The path to the file that caused the load error.
+    utils::fs::path file;
+
+    /// The reason for the error; may not include the file name.
+    std::string reason;
+
+    explicit load_error(const utils::fs::path&, const std::string&);
+    virtual ~load_error(void) throw();
+};
+
+
+}  // namespace engine
+
+
+#endif  // !defined(ENGINE_EXCEPTIONS_HPP)